I'm updating this because a French fan has now added to the conversation, for accuracy.
I think a lot of people have misunderstood the French education system, after watching Confrontation. I did a bunch of research into this for one of my fics - I have lived in the UK since I was 16 and have children in the British education system - and I originally grew up in the US. With all that in mind...
When you finish the first major stage of education:
Picking your focus / specialism(s):
France - Age 15, you can pick a stream, focusing on subjects relevant to what you want to do in life.
UK - Age 16, you can pick a stream, focusing on subjects relevant to what you want to do in life - there are also vocational courses, if you’re not remotely academic, and I bet there is something like this in France.
US - You are required to take all general mandatory subjects, even if you suck at them, until age 18, at which point you can finally specialise.
Speaking personally, when I lived in the US I was only given one elective in high school, and for my junior year (age 16) I realised I would have no time to fit that elective into my schedule because of all the science and maths requirements...subjects I was all but failing, because I knew I was artistic / literary-minded from a very young age. I was forced to suffer falling self-esteem, feeling like I was stupid and not good enough, simply because I didn’t have the ‘right’ brain type to fit with what the school wanted. There were other schools in the area that had slightly different requirements, but they all did some form of the same thing.
If you don’t know what you want to focus on yet:
France - There are generalist academic options where you do the usual variety of subjects, with the proviso that you get to choose if it’s more heavily weighted towards maths / science or towards liberal arts (see my personal anecdote above).
UK - Does something similar to France.
US - I was seriously considering dropping out of high school as soon as legally able (age 16) because I couldn’t cope with the pressures of the school system and my shattered confidence, despite previously being a straight-A student. However, if you drop out, you bear that stigma for life, no matter how much else you do - even though there are countries like France and the UK that legally release you from that education system at the same age or even younger. I’ve seen this happen to a lot of extremely intelligent American friends.
UK - You ONLY do classes directly related to your degree.
France - I'm told it's the same but that you don't get to choose unrelated electives for fun (you can do that in the UK - not lots, but a few over the years).
US - You are forced to take a lot of mandated subjects that have nothing to do with your course, e.g. local government or trigonometry even though you’re doing a writing degree, and you pay an absolute fortune for these / the required textbooks. (The most I ever spent on a book for my UK English degree course was £15, whereas textbooks in the US cost in the hundreds.)
What if you change your mind?
UK - Most jobs don’t care what degree you did, just that you did a degree. If you decide to do something that does need special qualifications, you can always go back and undertake them, at any age...with the proviso that you need to find the time and money.
France - I have been told it can be difficult, although in ways similar to the UK (and probably the US), where it depends on the job. Some jobs will always require retraining. It's always easier to do that training when you're younger and have fewer obligations
US - I can’t specifically comment, as I emigrated, but see above. Also, I have American friends who have gone through a LOT of hoops to try to change career paths in later life. This is probably an area where all countries could improve.
The French (and UK) system is not necessarily forcing teenagers to lock into a fixed career path with no looking back, at the age of 15. Nothing is perfect, but in many ways, I think the French system actually offers options for greater flexibility by allowing greater choice at a younger age, instead of being forced to take all these other classes they may never use again in life, possibly at the detriment of their mental health.
Don’t get me wrong - there are a lot of things I prefer about the US vs the UK system in the lead up to high school (I can’t comment on the French system during those years, as I have no experience). But I’m a big believer that we need to allow kids greater choice at a younger age, with the option to stay in generalist education if that’s really what they want.